Abstract
When water oxidation by photosystem II (PSII) is impaired, an oxidized chlorophyll (ChlZ+) is formed that quenches excitation and may prevent photodamage. Both the identification of this Chl+ and the mechanism of its oxidation and reduction are controversial. Using the available X-ray structures of PSII we calculated the efficiency of two proposed quenchers, ChlZ+(D1) and ChlZ+(D2). Of these two, only ChlZ+(D1) can quench to the degree observed experimentally. We also identify a chain of closely spaced pigments in the structure from Thermosynechococcus vulcanus that we propose to form a novel electron transport pathway between ChlZ(D1), β-carotene, P680+ and cytochrome b559.
| Original language | English |
|---|---|
| Pages (from-to) | 159-163 |
| Number of pages | 5 |
| Journal | FEBS Letters |
| Volume | 543 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - May 22 2003 |
Keywords
- Chlorophyll fluorescence
- Electron transport
- Excitation energy transfer
- Non-photochemical quenching
- Photosynthesis
ASJC Scopus subject areas
- Biophysics
- Structural Biology
- Biochemistry
- Molecular Biology
- Genetics
- Cell Biology
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Vasil'ev, S., Brudvig, G. W., & Bruce, D. (2003). The X-ray structure of photosystem II reveals a novel electron transport pathway between P680, cytochrome b559 and the energy-quenching cation, ChlZ+. FEBS Letters, 543(1-3), 159-163. https://doi.org/10.1016/S0014-5793(03)00442-3